Improvement in machines for forming temple-teeth



-Sheet 2.

'zshee'ts N. CHAPMAN. Machines for Forming Temple-Teeth;

a Patented May 12, 1874-.

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Wv'tneawas.

NITED" STATES PATENT OFFICE.

NATHAN CHAPMAN, OF HOPEDALE, MASSAOHUSETTS, ASSIGNOR TO WOONSOOKETMACHINE COMPANY.

IMPROVEMENT IN MACHINES FOR FORMING TEMPLE-TEETH.

Specification forming part of Letters Patent No. 150,828, dated May 12,1874; application filed February 24, 1874.

T0166 whom it may concern: 7

Be it known that I, NATHAN, CHAPMAN, of Hopedale, county of Worcesterand State of Massachusetts, have invented an Improved Machine for theFormation of Temple Teeth or Points; and I do hereby declare thefollowing to bea full, clear, and exact description thereof, reference-being had to the accompanying, drawings forming a part of thisspecification.

Figure 1 is a top view of my machine. Fig; 2 is a perspective view ofthe side and top. Fig; 3 is an end View, and Fig. 4 is a longitudinalsection, of the wire-holder.

My invention relates to improvements in machines for pointing wires fortemple-teeth 5 a and consists, first, in the employment of an abradingsurface, across the face of which a frame carrying the temple-teeth ismade to' able for the purpose, fastened securely to the shaft 1, saidshaft having at or near its outer end the pulley D, adjusted to theshaft by any of the well-known devices. The shaft Z is journaled to amovable frame, m, having a' projecting, tenon, f, at right angles withits lower surface, said tenon passing through the mortise or aperture g,formed through the supporting-frame. Passing through the side of themortise or aperture 9, and bearing against the tenon f, is the screw h,for securing the frame m at any desired elevation. In a parallel linewith the axis of the emery-wheel A, and placed above the center of saidwheel, is the sliding frame 0, having the wire-holding device Bjournaled in "a suitable manner at right angles with the emery-wheel A.A small spur-gear, L, is attached to the periphery of the wire-holderB,said gear working in the rack m, firmly secured to the supporting-frame.

The wire-holder is also provided with a slid in g collar, z", having itsinterior slotted or grooved to embrace the movable tapering jaws k k.The spring j, coiled around the periphcry of the wire-holder B, betweenthe spur-gear L and the collar i, forces this collar against theprojecting tapering jaws la la, pressing them against the wire 0, andthus preventing any motion of the wire other than that communicated bythe wire-holder B. J ournaled to the supporting-frame, at a suitabledistance from v and parallel to the wire-holder B, is the shaft E,having the pulley F and the wheels H and G. Projecting from the wheel Hat right angles, and the requisite distance from the center to securethe desired motion, is the pin 2, and projecting at right angles fromthe wheel G is the pin ac. Connecting the pin m and sliding frame 0 isthe arm I; and placed below the sliding frame, parallel to thewireholder B, and secured to the supporting-frame by suitablejournal-boxes, is the rock-shaft J, having at its outer end theright-angled arm 0, and at or near the mid-length the projecting arm m.'With the inner end of shaft J the arm n is connected, moving insuitable slides secured to the supporting-frame, and between said frameand the end of emery-wheel A is the knife'N, having a beveled edge, andits outer side provided with the pin 0. Parallel to the wire-holder B,and at right angles with the face of the emery-wheel A, is thehorizontal sliding bar I), having at its outer end theupwardly-projecting arm 60, with its gripingjaws a a Projecting downwardfrom the bar I), at a suitable distance from arm a is the arm 01.Extending from the pin 2 on the wheel H to the arm 0 on the rock-shaft Jis the arm K. The gripingjaws a a are oper- .ated by the action of thepin 3 projecting from the supporting-frame and depressing the end of thelever a, forming the lower gripingjaw a when the sliding bar I) is movedtoward the emery-wheel by the action of the arm m on the rock-shaft J.Any number of wire-holders may be employed.

The operation of my invention is as follows: The collar 11 on thewire-holder B being pressed against the spring j releases the taperingjaws k 70, and allows a suitable length of wire, 0

to be inserted in the wire -holder 13. The pressure being removed fromthe collar 13, the spring j forces the collar i against the taperingjaws L It, pressing them firmly against the wire 0. The emery-wheel Ahaving a rapid rotary motion imparted by a suitable belt or cord, theshaft E is set in motion, and the sliding frame 0, carrying thewire-holder B, is carried across the face of the emery-wheel A. Thewire-holder B is rotated. upon its axis while passing the emery-wheel Aby the ac-- tion of the spur-gear L and rack m, and a true cone of anydesired angle is thus formed on the end of the wire 0. hen the slidingrest has moved the requisite distance past the emery-wheel A, thesliding shaft 1), oarryin g the griping-jaws a? a, is moved forward bythe action of the arm m, and the jaws a a grasping the wire 0, force itthrough the wireholder the required distance, when the knife N is forcedupward, by the arm a acting upon the pin 0, against the projecting pointP, and the finished tooth or pin drops into a suitable receptacle; andthe sliding frame and wireholder pass back by the face of theemerywheel, when the same process is repeated, 6X- cept inserting thewire. S (see Fig. 2) is a spring, preferably of a coiled or spiral form,connecting the barb and one of the outer standards of the machine, thetension of which operates to move the bar I) outwardly or away from theemery-wheel A.

Among the advantages to be derived from the use of this invention are,first, dispensing with skilled, costly labor, and, at the same time,performing better work. None but experts can grind the temple-teeth tothe required accuracy, and no expert can compete with the inventiondescribed in accuracy or speed. After the temple-teeth are ground andfinished they are to be inserted in the wooden roll, and

for this purpose a steel die is used; and to force the teeth thus formedinto the roll without dulling the perfect point requires the nicestprecision. By my process the points are all formed alike, having thesame angle, and all fitting into the steel die with the greatestpreoision; and, in addition to this, the saving of costly material is ofitself an item of great importance; the inability of a hand workman toproperly handle a short piece of the wire; then the length of toothdesired can be produced with accuracy, so that when the teeth are forcedto their places in the roll the finished temple presents an even, truesuccession of points.

Having thus described my device, what I wish to claim as new and of myinvention is 1. The reciprocating frame 0, carrying the wire-holder B,in combination with the pinion L, rack M, and abrading-wheel A,substanlsially as described, and for the purpose set orth.

2. The wire-holder 13, provided with the longitudinal opening, asdescribed, and surrounded by the coiled spring in combina tion with thesliding collar 2' and wedges k k, for the purpose of clamping the wire,substantially as described.

3. The combination and arrangement, as described, of the adjustableabrading-wheel,

the reciprocating frame, hollow rotating wireholder, griping and feedingjaws, and cutter, substantially as described, and for the purposes setforth.

In testimouy of this invention I hereunto set my hand. 1

NATHAN CHAPMAN.

Witnesses:

J. P. PrLLsBURY, J osnrn WHITAKER.

